No worries. You shouldn't have to open your cannister any more than 8 times per year in order to clean something--4x for major media cleaning (bioballs or other media that harbors bacteria) + 4x for replacing your fine filter media (the stuff that keeps your water sparkling clean). So, in order to clean a basket of media, if you have 2 separate baskets, you should clean them no more than 2x per basket per year, which would be 4x per year for 2 baskets (alternating baskets). This should be a given provided you keep your coarse filter pads clean. They help protect the biomedia from excess 'mechanical' debris. The bottom line is that you don't want to clog the bacteria harboring material from mechanical debris from the tank like poop and dead plant stuff.
The bottom line is cannister filters last much longer between cleanings than power filters. That's part of their purpose, and that purpose is to maintain superior biological filtration. If the cannister you have cannot adhere to my requirements, then you need more filtration. If mechanical filtration is necessary, then couple a power filter with your cannister.